21365651265404 has 48 divisors (see below), whose sum is σ = 39679312095360. Its totient is φ = 10031585034240.

The previous prime is 21365651265397. The next prime is 21365651265473. The reversal of 21365651265404 is 40456215656312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61241549 + ... + 61589435.

It is an arithmetic number, because the mean of its divisors is an integer number (826652335320).

Almost surely, 2^{21365651265404} is an apocalyptic number.

It is an amenable number.

21365651265404 is a deficient number, since it is larger than the sum of its proper divisors (18313660829956).

21365651265404 is a wasteful number, since it uses less digits than its factorization.

21365651265404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349958 (or 349956 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 21365651265404 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred fifty-one million, two hundred sixty-five thousand, four hundred four".